"Scientific theories stand or fall on their logical merits, not on how human agents apply them."
Then why strain credulity, denying the (perhaps unforeseen) societal consequences of certain scientific theories? Everything I've read points to science having run, screaming, away from eugenics, once all the many Nazi atrocities began coming to light. Did eugenics fall on logical merit, or did the application of eugenics, taken to its logical extreme, create societal consequences so utterly inhuman, as to place eugenics into some special, pariah-class memory hole, for the scientific endeavors you'd rather forget?
Science describes processes. Eugenics is a goal -- a value judgement. Surely you can't pretend you don't know the difference.
I would say it's just better hidden. Sweden has been sterilizing retarded people for some time. I'm not clear whether they ever quit. Here in the States, birth control is a requirement for living in a group home.
I don't know of any culture that hasn't practiced eugenics, if only passively.